<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="utf-8">
    <title>我的 OJ 平台</title>
    <meta name="description" content="Charcoal is a free Bootstrap 4 UI kit build by @attacomsian at Wired Dots." />
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <!--Bootstrap 4-->
    <link rel="stylesheet" href="css/bootstrap.min.css">
</head>
<body>

<nav class="navbar navbar-expand-md navbar-dark fixed-top sticky-navigation">
    <a class="navbar-brand font-weight-bold" href="#">我的 OJ 系统</a>
    <button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#topMenu" aria-controls="navbarSupportedContent" aria-expanded="false" aria-label="Toggle navigation">
        <span class="navbar-toggler-icon"></span>
    </button>

    <div class="collapse navbar-collapse" id="topMenu">
        <ul class="navbar-nav ml-auto">
        </ul>
    </div>
</nav>

<!--hero section-->
<section class="bg-hero">
    <div class="container">
        <div class="row vh-100">
            <div class="col-sm-12 my-auto text-center">
                <h1>我的 OJ 平台</h1>
                <p class="lead text-capitalize my-4">
                    基于 Java Sevlet 实现的 OJ 系统
                </p>
                <a href="https://gitee.com" class="btn btn-outline-light btn-radius btn-lg">项目链接</a>
            </div>
        </div>
    </div>
</section>

<!--components-->
<section class="my-5 pt-5">
    <div class="container">
        <!-- Brand color  -->


        <!-- Links  -->


        <!-- Grid  -->


        <!-- Fonts  -->


        <!-- Buttons  -->


        <!-- Forms  -->


        <!-- Dropdown  -->


        <!-- Navs  -->


        <!-- Navbar  -->


        <!-- Tables  -->
        <div class="row mb-5" id="tables">
            <div class="col-sm-12">
                <div class="mt-3 mb-5">
                    <h3>题目列表</h3>
                    <table class="table table-striped">
                        <thead>
                        <tr>
                            <th>编号</th>
                            <th>标题</th>
                            <th>难度</th>
                        </tr>
                        </thead>
                        <tbody id="problemTable">
                        <!-- <tr>
                            <td>1</td>
                            <td>
                                <a href="#">两数之和</a>
                            </td>
                            <td>简单</td>
                        </tr> -->
                        </tbody>
                    </table>
                </div>
            </div>
        </div>

        <!-- Pagination  -->


        <!-- Jumbotron  -->


        <!-- Cards  -->


        <!-- Tooltip  -->


        <!-- Popovers  -->


        <!-- Badges  -->


        <!-- Modals  -->


        <!-- Alerts  -->


        <!-- Progress bars  -->


        <!-- List group  -->


        <!-- Image thumbnails  -->


        <!-- Figures  -->


        <!-- Breadcrumbs  -->


        <!-- Carousel  -->


        <!-- Close  -->


        <!-- Code -->

    </div>
</section>

<!--footer-->
<section class="py-5 bg-dark">
    <div class="container">
        <div class="row">
            <div class="col-md-6 offset-md-3 col-sm-8 offset-sm-2 col-xs-12 text-center">
                <!-- <h3>Upgrade to Pro Version</h3>
                <p class="pt-2">
                    We are working on <b>Charcoal Pro</b> which will be released soon. The pro version
                    will have a lot more components, sections, icons, plugins and example pages.
                    Join the waiting list to get notified when we release it (plus discount code).
                </p>
                <a class="btn btn-warning" href="https://wireddots.com/newsletter">Join Waiting List</a>
                <hr class="my-5"/> -->
                <p class="pt-2 text-muted">
                    &copy; li
                </p>
            </div>
        </div>
    </div>
</section>

<script src="https://code.jquery.com/jquery-3.1.1.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.12.3/umd/popper.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-beta.2/js/bootstrap.min.js"></script>
<script src="js/app.js"></script>
<script>
    // 在页面加载的时候, 尝试从服务器获取题目列表. 通过 ajax 的方式来进行获取
    function getProblems() {
        // 1. 先通过 ajax 从服务器获取到题目列表.
        $.ajax({
            url: "problem",
            type: "GET",
            success: function(data, status) {
                // data 是响应的 body, status 是响应的状态码
                // 2. 把得到的响应数据给构造成 HTML 片段
                makeProblemTable(data);
            }
        })
    }

    // 通过这个函数来把数据转换成 HTML 页面片段
    function makeProblemTable(data) {
        let problemTable = document.querySelector("#problemTable");
        for (let problem of data) {
            let tr = document.createElement("tr");

            let tdId = document.createElement("td");
            tdId.innerHTML = problem.id;
            tr.appendChild(tdId);

            let tdTitle = document.createElement("td");
            let a = document.createElement("a");
            a.innerHTML = problem.title;
            a.href = 'problemDetail.html?id=' + problem.id;
            a.target = '_blank';
            tdTitle.appendChild(a);
            tr.appendChild(tdTitle);

            let tdLevel = document.createElement("td");
            tdLevel.innerHTML = problem.level;
            tr.appendChild(tdLevel);

            problemTable.appendChild(tr);
        }
    }

    getProblems();
</script>
</body>
</html>
